Leominster, MA 01541 Frost Dates
01541, near Leominster, MA: the frost window
The last spring frost here typically falls around 05/12, about 257 days from today. Fall's first freeze usually shows up around 10/01, roughly 141 days after the last spring frost.
Zone 6a (-10 to -5°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Leominster, not a forecast for this year.
Stretching the season past the first frost
Leominster's growing season runs out in roughly 5 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
05/12 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/27 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/28 and only about 1 year in 10 sees frost after that.
Leominster against the rest of the dataset
At roughly 141 frost-free days, Leominster places 36,865 of 40,283 ZIP codes in this dataset. Within MA, it ranks 700 of 712.
Learn more
Two guides worth reading on 01541: the frost range, on how to read the range around Leominster's dates instead of trusting one, and local microclimates, on what one yard in Leominster can differ from the 01541 normal.